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/*
* Copyright (c) 2014 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _ASM_ARCH_MRCCACHE_H
#define _ASM_ARCH_MRCCACHE_H
#define MRC_DATA_ALIGN 0x1000
#define MRC_DATA_SIGNATURE (('M' << 0) | ('R' << 8) | ('C' << 16) | \
('D'<<24))
__packed struct mrc_data_container {
u32 signature; /* "MRCD" */
u32 data_size; /* Size of the 'data' field */
u32 checksum; /* IP style checksum */
u32 reserved; /* For header alignment */
u8 data[0]; /* Variable size, platform/run time dependent */
};
struct fmap_entry;
struct spi_flash;
/**
* mrccache_find_current() - find the latest MRC cache record
*
* This searches the MRC cache region looking for the latest record to use
* for setting up SDRAM
*
* @entry: Information about the position and size of the MRC cache
* @return pointer to latest record, or NULL if none
*/
struct mrc_data_container *mrccache_find_current(struct fmap_entry *entry);
/**
* mrccache_update() - update the MRC cache with a new record
*
* This writes a new record to the end of the MRC cache. If the new record is
* the same as the latest record then the write is skipped
*
* @sf: SPI flash to write to
* @entry: Position and size of MRC cache in SPI flash
* @cur: Record to write
* @return 0 if updated, -EEXIST if the record is the same as the latest
* record, other error if SPI write failed
*/
int mrccache_update(struct spi_flash *sf, struct fmap_entry *entry,
struct mrc_data_container *cur);
#endif
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